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The normal course of invasion and development of beet eelworm in sugar beet, summer turnip rape (Sommerrübsen), swede rape (Raps) and white mustard was studied during the first 21 days of plant growth. The number of larvae in the whole root system was greatest in swede rape followed by white mustard, beet and turnip rape. There were no appreciable differences in the time of appearance of the different larval stages in the different host plants. The density of larvae per 10 cm. of root length was again highest in swede rape followed by turnip rape, mustard and beet. Among other things which contribute to a high larval density is relatively slow growth in root length. The percentage of larvae in stage III which dveloped from larvae invading in stage II was greatest in the roots of swede rape and beet. Swede rape therefore appears to be the best host plant amongst those tested and is likely to be the most useful in pot tests.